The Eagles opened their first Kelly practice to the media Monday. It was a radical departure from the Andy Reid era, to put it mildly.

There’s a method practicing to the music of Van Halen, Nicki Minaj, Duran Duran, and Black Sabbath, among others. Kelly didn’t care to share it or his personal favorites, citing time constraints.

“There’s a lot of science behind it,” Kelly said. “But I’ve got 12 minutes left in this so I can’t really get into the details of it. But there’s some science behind it.

“We’ve used it for a while.”Kelly guided Oregon to a 46-7 record with practices that were more up-tempo than what he’s run so far from the Eagles, who are transitioning to new schemes in addition to the new culture.

Eagles players say the noise challenges them to concentrate.

“When you play in a game … there could be 100,000 people in the stands,” quarterback Nick Foles said. “But I like it. I like the music. There’s always a purpose. It really helps with communication. You really have to stress communication because it is loud. And with cadence and everything you have to be loud and make sure everybody is on the same page.”

Eagles running back LeSean McCoy thinks the music helps with the tempo.

“It’s definitely different,” McCoy said. “It’s just the operation of how you’re moving so fast with the offense and the defense. It’s different but I like it.”

Kelly clearly wants to practice fast in addition to loud, his offensive and defensive units sometimes ripping off more than 20 plays in 10-minute blocks of team drills Monday. There’s a lot less standing around than during the previous head coaching regime, at least the part of the regime when opened to the media.

Unlike the last era, the depth chart really is meaningless at this point, just as Kelly has suggested.

Among the quarterbacks, for example, only Dennis Dixon, who played for Kelly in Eugene, has a grasp for the way the coach wants his offense to line up and play. The quarterbacks are challenged not only by the quick decisions demanded in the read option and the running game, but by getting portions of the signals from as many as three sources, including two providing hand signals on the sideline.

When it was suggested Michael Vick was getting most of the first-team snaps, Kelly challenged the media to count the repetitions, saying they were split almost equally with Foles.

McCoy also said it’s a mistake to look at which skills players practice with the so-called first and second team units because Kelly’s philosophy basically is to put fresher, faster bodies on the field to create mismatches against defenders who don’t come off the field.

“We all switch in and out,” McCoy said. “It’s all about the pace. The majority of the time the first group will go. But (the coaches) don’t want anybody to slow it down. So they just fill it right in. It’s a fast-paced offense and we don’t want to slow down. There might be a drill where you might have run a lot and you’re the starter but you might need your breath. So the next guy goes in.

“It’s not really a first-team, second-team, third-team type of thing here at all. That was the biggest difference because you’re like ‘whoa, why am I going with the twos?’ The scheme, the strategy, is to keep it going.”

That’s the essence of Kelly.Make no mistake, there have been several changes, starting with the mandatory relocation of players in the locker room.

At times Monday there were five different quarterbacks throwing passes in the same drill to five different receivers, a dizzying experience impossible to capture in a standard frame.

The media not only was allowed to sit in the bleachers adjoining the practice field; the placement was mandatory.

“It’s very exciting,” Vick said. “There’s a lot of innovation. It’s just refreshing for a lot of us and we’re trying to make sure that we make it work.”

It’s early but the only real question is whether Kelly can have the success he had at Oregon in the NFL, where he’s never coached.

If Kelly wins, a lot of NFL owners could adopt the VH1 practice concept.

In this South Philly neighborhood, it’s safe to say there hasn’t been anything like this musically since American Bandstand.